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| Titel |
Sensitivity studies to determine the effect of rotational Raman scattering on ozone profile retrieval from backscattered UV measurements |
| VerfasserIn |
J. Meijer, J. F. de Haan, P. F. Levelt |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250022612
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| Zusammenfassung |
| Ozone profile retrieval from backscattered UV measurements has gradually
developed since SBUV retrievals. Currently we try to improve the ozone profile
algorithm used for the Ozone Monitoring Instrument (OMI) on board of Aura. In
particular, our aim is to improve the retrieval of tropospheric ozone.
At the quadrennial ozone symposium in 2004 it was shown that advanced
treatment of rotational Raman scattering is required if the differential
optical absorption spectroscopy is used to determine the total ozone
column. Therefore we are investigating whether we need rotational Raman
scattering in the forward model used for the ozone profile retrieval and
whether including rotational Raman scattering improves the information content
on tropospheric ozone. We expect to gain more information on tropospheric
ozone because rotational Raman scattering increases with multiple scattering
and is therefore more sensitive to the lower parts of the atmosphere than the
elastic scattering.
For this purpose we use wavelengths from 270 up to 330 nm to sample both the
troposphere and the stratosphere. We have created an accurate forward model that
accounts for polarization effects (through look-up tables) and rotational
Raman scattering. The current OMI ozone algorithm uses an approximation for
rotational Raman scattering. With our forward model we can assess the accuracy
of this approximation. We will present results of this assessment. In
addition we hope to present the initial results of a sensitivity study that
includes the full diagnostic information provided by the optimal estimation
method. |
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